Need some hope!

I've just set 20 eggs 3 days ago in the bator and I'm really starting to think all but one may not be viable. I candled when I set them in the first day then again today, which is technically day 4. Day 1 I had one that was clearly 3 days ahead of the rest and now there's a blurry red ring all the way around it but I'm still seeing some good veins. I've read several times around here to wait till 7-10 days before tossing them in hopes of getting some clarity. I have 1 other blood ring, but that one too still had some really good looking veins and it doesn't look like the pictures I'm seeing around here. Most of the rest are clear as far as I can tell but the shells are really thick so I'm waiting on those too.

So my question is, can I keep adding eggs over this next 4-6 days or so to the incubator? And, does candling do any damage, am I okay to candle every 3-4 days till I'm sure I've culled out the duds?

Candling is an okay thing to do if needed. Just remember to be really fragile with your eggs. Go into a dark room to see what is needed to be seen. When an embryo dyes it's normally really dark. I believe that red rings are an okay thing for eggs because it means that they're fertile. The eye is the first thing to develop around that weeks mark. But only check your fertile eggs every once in a while like when the major parts develop and by the 18th day do not touch the birds in risk of failing to hatch

Turning an egg is a must for an egg so the embryo does not stick to the shell of the egg. Some incubators are automatically turning incubators. I used a Brinsea when I hatched out some Java's. If you don't have automatic turning do the tic tac toe method where you gently use a marker to put an X on one side and O on the other that way you can turn it properly. When you have a broody hen it's a natural behavior for her to turn the eggs.

If you set the eggs three days ago (Wed.?) Then today is only day 3. The first 24 hours is Day 1 - Thursday. Friday would have been Day 2, etc. Three days is really too early to be candling and seeing any clear development. I would wait until at least Wed. to candle again. Remember that the more you handle your eggs, the greater the chance of accidentally dropping one or transferring bacteria from your hands to the eggs, reducing their chances of hatching.

If you set the eggs three days ago (Wed.?) Then today is only day 3. The first 24 hours is Day 1 - Thursday. Friday would have been Day 2, etc. Three days is really too early to be candling and seeing any clear development. I would wait until at least Wed. to candle again. Remember that the more you handle your eggs, the greater the chance of accidentally dropping one or transferring bacteria from your hands to the eggs, reducing their chances of hatching.

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That's good to know, thanks!! What do you think about adding eggs at his point? I get at least 6 a day from my ladies and by incubator will hold 40, it's half full and I'd really like another dozen in there if possible.

I think water candling is used as a last resort, when eggs are past due to hatch. Maybe not, but I can't see any benefit in sticking your eggs in water, taking the chance of that water absorbing in through the shell, possibly causing future problems with the chick. My own personal opinion. Also, the eggs won't be wiggling within the first few days of incubation. They are only veins at that point.

OP, I would not add more eggs at this point, but there again, that's personal preference. I don't like having a staggered hatch. You'll have hatch dates several days apart. There are those who do it all the time, and it works for them. Do a search on "staggered hatches" and you'll get some good information on how to do that. I usually save up all the eggs I want to incubate and start them all on the same day. One thing you could do, if you don't think your eggs are viable after your next candling, is toss them and start all over with a fresh bunch of eggs. Start setting them aside now so you'll have as many as you want.